What to look for?

Hey guys i recently took off the pipe on my 1996 cr125 to clean and inspect the area and i was wondering if there are any pointers you guys can give me when it comes to the cylinder/piston. Such as what it should look like. Some things that worry me are when i have the engine at BDC I noticed blow by on the piston but above the ring. I also noticed scratches on the piston it self below the ring and on the cylinder wall it self.

They look something like this but a little less sever.

Cylinder wall.jpg

Piston.jpg 

I was just wondering does this warrant a tear down of the top end to inspect whats going?

Any help would be greatly appreciated.  

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